Power supply device, storage medium, and control method

Abstract

A power supply device is applicable to a system including an electrical storage unit, an inverter, a rotary electric machine, and a drive circuit. The power supply device includes a switching power supply having a power supply control unit. The switching power supply supplies power to the drive circuit by switching control of the power supply control unit. The drive circuit is operated when the power is fed from the switching power supply, and monitors a state of a switch of the inverter. The power supply control unit changes a switching manner of the switching power supply in a first state in which the electrical storage unit is externally charged through the inverter or switching control of the switch is stopped, from a switching manner of the switching power supply in a second state in which the switching control of the switch for driving the rotary electric machine is performed.

What is claimed is: 
     
         1 . A power supply device applicable to a system, the system including an electrical storage unit, an inverter connected to the electrical storage unit, a rotary electric machine having armature windings connected to the inverter, and a drive circuit driving a switch of the inverter, wherein
 the system includes:   a loudspeaker; and   an AM receiver that detects and demodulates modulated waves that are obtained by modulating carrier waves using AM modulation, and outputs the demodulated waves to the loudspeaker as an audio signal,   the power supply device comprises a switching power supply that has a power supply control unit and supplies electric power to the drive circuit by switching control of the power supply control unit,   the drive circuit is operated when the electric power is fed from the switching power supply, and has a function of monitoring a state of the switch,   the power supply control unit performs a change process that changes a switching manner of the switching power supply in a first state in which the electrical storage unit is charged from an external power supply through the inverter or switching control of the switch is stopped, from a switching manner of the switching power supply in a second state in which the switching control of the switch for driving the rotary electric machine is performed,   the power supply control unit sets a switching frequency of the switching power supply in the second state to a frequency in a specific frequency range,   the power supply control unit performs, as the change process, a process that shifts the switching frequency of the switching power supply in the first state to a frequency lower than a lower limit of the specific frequency range, so that a level of noise produced due to switching control of the switching power supply becomes a tolerance or lower in the specific frequency range, and   a frequency range that the AM receiver is configured to receive is higher than the specific frequency range.   
     
     
         2 . The power supply device according to  claim 1 , wherein
 the power supply control unit determines whether a current state is the first state or the second state based on information transmitted from a control unit outside the power supply device, and   if determining that the current state is the first state, the power supply control unit performs the change process.   
     
     
         3 . The power supply device according to  claim 1 , wherein
 the power supply control unit determines whether a current state is the first state or the second state based on drive information of the drive circuit, and   if determining that the current state is the first state, the power supply control unit performs the change process.   
     
     
         4 . The power supply device according to  claim 1 , wherein
 the first state is a state in which the electrical storage unit is charged from the external power supply through the inverter,   the system includes a current sensor that detects a charging current flowing from the inverter to the electrical storage unit,   the power supply control unit determines whether a current state is the first state or the second state based on a detection value of the current sensor, and   if determining that the current state is the first state, the power supply control unit performs the change process.   
     
     
         5 . The power supply device according to  claim 1 , further comprising an input current detection unit that detects an input current of the switching power supply and outputs the detected input current to the power supply control unit, wherein
 the power supply control unit determines whether a current state is the first state or the second state based on a received detection value of the input current detection unit, and   if determining that the current state is the first state, the power supply control unit performs the change process.   
     
     
         6 . A storage medium that stores a program applicable to a system, the system including an electrical storage unit, an inverter connected to the electrical storage unit, a rotary electric machine having armature windings connected to the inverter, a drive circuit driving a switch of the inverter, and a switching power supply that has a power supply control unit and supplies electric power to the drive circuit by switching control of the power supply control unit, wherein
 the system includes:   a loudspeaker; and   an AM receiver that detects and demodulates modulated waves that are obtained by modulating carrier waves using AM modulation, and outputs the demodulated waves to the loudspeaker as an audio signal,   the drive circuit is operated when the electric power is fed from the switching power supply, and has a function of monitoring a state of the switch,   the program causes the power supply control unit to perform:   a process that determines whether a current state is a first state in which the electrical storage unit is charged from an external power supply through the inverter or switching control of the switch is stopped, or a second state in which the switching control of the switch for driving the rotary electric machine is performed; and   a change process that changes a switching manner of the switching power supply in a case in which it is determined that the current state is the first state, from a switching manner of the switching power supply in a case in which it is determined that the current state is the second state,   the switching manner of the switching power supply in the case in which it is determined that the current state is the second state sets a switching frequency of the switching power supply to a frequency in a specific frequency range,   the change process shifts the switching frequency of the switching power supply in the first state to a frequency lower than a lower limit of the specific frequency range, so that a level of noise produced due to switching control of the switching power supply becomes a tolerance or lower in the specific frequency range, and   a frequency range that the AM receiver is configured to receive is higher than the specific frequency range.   
     
     
         7 . A control method applicable to a system, the system including an electrical storage unit, an inverter connected to the electrical storage unit, a rotary electric machine having armature windings connected to the inverter, a drive circuit driving a switch of the inverter, and a switching power supply that has a power supply control unit and supplies electric power to the drive circuit by switching control of the power supply control unit, wherein
 the system includes:   a loudspeaker; and   an AM receiver that detects and demodulates modulated waves that are obtained by modulating carrier waves using AM modulation, and outputs the demodulated waves to the loudspeaker as an audio signal,   the drive circuit is operated when the electric power is fed from the switching power supply, and has a function of monitoring a state of the switch,   the method causes the power supply control unit to perform:   a process that determines whether a current state is a first state in which the electrical storage unit is charged from an external power supply through the inverter or switching control of the switch is stopped, or a second state in which the switching control of the switch for driving the rotary electric machine is performed; and   a change process that changes a switching manner of the switching power supply in a case in which it is determined that the current state is the first state, from a switching manner of the switching power supply in a case in which it is determined that the current state is the second state,   the switching manner of the switching power supply in the case in which it is determined that the current state is the second state sets a switching frequency of the switching power supply to a frequency in a specific frequency range,   the change process shifts the switching frequency of the switching power supply in the first state to a frequency lower than a lower limit (RL) of the specific frequency range, so that a level of noise produced due to switching control of the switching power supply becomes a tolerance or lower in the specific frequency range, and   a frequency range that the AM receiver is configured to receive is higher than the specific frequency range.